JP2012197742A - Evaporated fuel treatment device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the outflow of fuel from a fuel tank to the side of a fuel adsorption means when a motorcycle falls, in the motorcycle in which a fuel gas is introduced from the fuel tank into the fuel adsorption means arranged below the upper surface of the fuel tank through a charge pipe passage.SOLUTION: A charge pipe passage 84 includes a first tank-side pipe passage part 84a which is connected to an upper surface of a fuel tank 42, and a second tank-side pipe passage part 84b which is communicably connected with the first tank-side pipe passage part 84a and extends toward the other side of the fuel tank 42 from one side thereof in the vehicle widthwise direction on an end portion on a fuel tank 42 side, and the first and second tank-side pipe passage parts 84a, 84b are fixed to the upper surface of the fuel tank 42.

Description

  The present invention provides an engine that exhibits power for driving rear wheels, a fuel tank that stores fuel supplied to the engine, and a fuel gas evaporated in the fuel tank that is adsorbed outside the fuel tank. In particular, the present invention relates to a motorcycle including fuel adsorbing means disposed below the upper surface of the fuel tank and a charge pipe for introducing fuel gas from the fuel tank to the fuel adsorbing means, and more particularly to improvement of an evaporated fuel processing apparatus.

  A motorcycle is known in Patent Document 1 in which fuel gas generated in a fuel tank is guided to a canister disposed obliquely below and in front of the fuel tank through a charge line.

Japanese Patent No. 4108954

  However, in the one disclosed in Patent Document 1, since the charge line is connected to the canister through only the left side of the motorcycle from the upper surface of the fuel tank, when the motorcycle falls to the left side, the fuel There is a possibility that a lot of fuel flows out of the tank to the canister side.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an evaporative fuel processing device in a motorcycle that can suppress the outflow of fuel from the fuel tank to the fuel adsorbing means side when the vehicle falls over. To do.

  In order to achieve the above object, the present invention provides an engine that exhibits power for driving a rear wheel, a fuel tank that stores fuel supplied to the engine, and fuel gas evaporated in the fuel tank. In a motorcycle comprising fuel adsorbing means disposed below the upper surface of the fuel tank so as to adsorb outside the tank, and a charge conduit for guiding fuel gas from the fuel tank to the fuel adsorbing means, A tank-side first conduit portion connected to the upper surface of the fuel tank, and a tank that extends from one side of the fuel tank to the other side in the vehicle width direction while being connected to the tank-side first conduit portion A first characteristic is that a side second pipe section is provided at an end on the fuel tank side, and the tank side first and second pipe sections are fixed to the upper surface of the fuel tank.

  According to the present invention, in addition to the configuration of the first feature, the tank-side first pipe line portion extends from the connection portion to the upper surface of the fuel tank to one side of the fuel tank in the vehicle width direction. The second feature is that the two pipe sections are connected.

  In the present invention, in addition to the configuration of the second feature, a fuel supply port is provided on one side in the vehicle width direction of the upper surface of the fuel tank, and is connected to the upper surface of the fuel tank at a position offset from the fuel supply port. A third feature is that the first conduit portion and the tank-side second conduit portion are continuously provided so as to surround the fuel filler port from the periphery.

  According to the present invention, in addition to the configuration of the third feature, a tray for receiving fuel spilled from the fuel filler port is disposed around the fuel filler port, and part of the tank side first and second pipe sections are provided. It is the fourth feature that it is arranged to pass under the tray.

  According to the present invention, in addition to any one of the first to fourth features, the charge pipe is connected to the tank-side second pipe section on the other side in the vehicle width direction and the charge pipe. A fifth feature is that it has a tank-side third pipe line portion having the highest position portion arranged at the highest position among them at the intermediate position.

  According to the present invention, in addition to the configuration of the fifth feature, at least a portion including the highest portion of the tank side third conduit portion is formed of an elastic tube, and the highest portion of the elastic tube is the fuel tank. It is a sixth feature that the uppermost portion support portion provided on the upper portion is supported from below.

  According to the present invention, in addition to the configuration of the fifth or sixth feature, a portion from the highest part of the charge pipeline to the connection portion to the fuel tank has a downward slope toward the connection portion side. The seventh feature is that it is piped.

  In addition to any of the configurations of the fifth to seventh features, the present invention is a crankcase in which the fuel adsorbing means stores oil that adsorbs the fuel gas and constitutes a part of the engine. The charge pipe is connected to the crankcase so that the downstream end of the charge pipe is open to the oil, and prevents back flow of the fuel gas to the fuel tank side downstream of the highest part of the charge pipe. An eighth feature is that the first check valve is interposed so as to be supported by the fuel tank.

  According to the present invention, in addition to the configuration of the eighth feature, the upper surface of the fuel tank has a high portion where the fuel filler opening is provided and a low portion lower than the high portion, and the first check valve is low. It is a ninth feature that it is arranged on the part.

  In addition to the ninth feature, the tenth feature of the present invention is that the lower portion is formed so as to be inclined toward the crankcase side.

  In addition to any of the configurations of the eighth to tenth aspects, the present invention guides the atmosphere into the fuel tank to a branch portion provided in the charge line on the fuel tank side of the first check valve. An eleventh feature is that the atmosphere introduction pipe is connected, and a second check valve for preventing the flow from the fuel tank side is interposed in the atmosphere introduction pipe.

  According to the present invention, in addition to any one of the configurations of the first to eleventh features, a portion of the elastic tube constituting at least a part of the charge pipe is disposed on the fuel tank. A twelfth feature is that the fuel tank is covered from above by a tank cover that is held by an upper open clamper provided on the upper surface and prevents the elastic tube from being detached from the upper open clamper.

  Furthermore, in addition to any of the first to twelfth features of the present invention, the outer surface of the fuel tank is painted, and a metal pipe constituting a part of the charge pipe is fastened to the fuel tank. This is a thirteenth feature.

  According to the first feature of the present invention, the tank-side first conduit connected to the upper surface of the fuel tank, the tank-side first conduit and the other side of the fuel tank in the vehicle width direction. The tank-side second conduit portion extending to the tank-side first conduit portion constitutes a part of the charge conduit and is fixed to the upper surface of the fuel tank, so that the tank-side first conduit portion is Regardless of the position connected to the fuel tank at any position in the vehicle width direction, the amount of fuel flowing out from the fuel tank to the fuel adsorbing means via the charge line when the motorcycle falls can be suppressed, and the charge pipe Since at least a part of the road can be previously attached to the fuel tank, it is possible to contribute to the improvement of the assembling property.

  Further, according to the second feature of the present invention, the tank-side first conduit portion extending from the connecting portion to the upper surface of the fuel tank to one side of the fuel tank in the vehicle width direction is connected to the tank-side second conduit portion. Therefore, the outflow of fuel at the time of falling can be effectively suppressed.

  According to the third aspect of the present invention, the fuel filler port is provided on one side in the vehicle width direction on the upper surface of the fuel tank, and the tank-side first conduit portion and the tank-side second conduit portion surround the fuel filler port from the periphery. Therefore, a part of the tank-side first and second pipe sections can be piped with a large curvature using a dead space around the fuel filler port, and the tank-side first and second pipes The arrangement of the parts can be facilitated.

  According to the fourth aspect of the present invention, the tank side first and second pipe sections pass under the tray disposed around the fuel filler port, so that the tank surrounds the fuel filler port. Even if part of the side first and second pipe sections are piped, the area of the tray can be increased.

  According to the fifth feature of the present invention, the tank-side third conduit portion connected to the tank-side second conduit portion on the other side in the vehicle width direction is disposed at the highest position among the charge conduits. Since it has the highest position in the middle position, it is possible to more effectively suppress the outflow of fuel when it falls.

  According to the sixth aspect of the present invention, the portion including at least the highest portion of the tank side third pipe portion is made of an elastic tube, and the highest portion is the highest portion support portion provided in the fuel tank. Therefore, the height of the highest part can be determined by the height of the highest part support part, so that the degree of freedom in design can be increased.

  According to the seventh aspect of the present invention, since the charge pipe line has a downward slope between the highest part and the connection portion to the fuel tank, the charge pipe is accumulated in the charge pipe line from the highest part to the fuel tank. It becomes easy to return the fuel to the fuel tank side.

  According to the eighth aspect of the present invention, the crankcase of the engine is fuel adsorbing means that adsorbs fuel gas to oil, and is connected to the fuel tank side downstream of the highest portion of the charge line. Since the first check valve for preventing the backflow is interposed, the first check valve can effectively prevent the oil in the crankcase from flowing to the fuel tank side, and the first check valve. Is supported by the fuel tank, so assembling is improved.

  According to the ninth aspect of the present invention, the upper surface of the fuel tank has a high portion where a fuel filler opening is provided and a low portion lower than the high portion, and the first check valve is disposed on the low portion. Therefore, it can be avoided that the arrangement position of the first check valve becomes high.

  According to the tenth feature of the present invention, since the lower portion is inclined so as to be lowered toward the crankcase side, the flow of the fuel gas passing through the first check valve can be smoothed.

  According to the eleventh feature of the present invention, there is provided a branching portion in the charge pipe line on the fuel tank side with respect to the first check valve to guide the atmosphere into the fuel tank and prevent the flow from the fuel tank side. (2) Since the air introduction pipe through which the check valve is interposed is connected to the branch portion, when the pressure in the fuel tank becomes negative, the air is introduced into the fuel tank so that the pressure in the fuel tank is increased to the atmospheric pressure. In addition, the second check valve can prevent the fuel gas from being discharged to the outside through the air introduction pipe.

  According to the twelfth aspect of the present invention, an upper opening clamper that holds a portion of the elastic tube constituting at least a part of the charge pipe that is disposed on the fuel tank is provided on the upper surface of the fuel tank. The tank cover that prevents the elastic tube from detaching from the clamper is arranged so that the fuel tank is covered from above, and a part of the charge line can be supported on the fuel tank with a simple structure. Improves.

  Further, according to the thirteenth feature of the present invention, the outer surface of the fuel tank is painted, and the metal pipe constituting a part of the charge pipe is fastened to the fuel tank, so that the metal pipe is welded. Compared with the case of fixing to the fuel tank, it is not necessary to mask the metal pipe, and the coating cost can be reduced.

It is a top view which shows the rear part of a vehicle body frame, a fuel tank, and an engine. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1. It is the perspective view seen from the arrow 4 direction of FIG. It is the perspective view seen from the 5 arrow direction of FIG. 1 is a side view of a motorcycle. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6 in a state where a boarding seat is omitted. It is the perspective view which looked at the part shown in FIG. 7 from diagonally forward. It is sectional drawing which follows the 9-9 line of FIG. FIG. 10 is a view taken in the direction of arrow 10 in FIG. 1. It is an 11-11 line expanded sectional view of FIG. FIG. 12 is a sectional view taken along line 12-12 of FIG.

  Embodiments of the present invention will be described with reference to FIGS. In the following description of the embodiments, front and rear and left and right refer to directions viewed from a passenger on a motorcycle. "..." is used to omit repetition of the same reference numerals.

  1 to 5, a pair of left and right seat frames 15 and 15 constituting a part of a body frame F of a motorcycle of a scooter type are made of pipes, and an inclined portion 15a that inclines backward. And horizontal portions 15b extending rearward from the upper ends of the inclined portions 15a... And the rear ends of both horizontal portions 15b.

  A front portion of the power unit P is supported on the vehicle body frame F below the seat frames 15... Via the link mechanism 17 so as to be swingable up and down, and a rear wheel WR disposed on the right side of the rear portion of the power unit P. Is supported at the rear of the power unit P. Thus, the power unit P is provided between the engine E and the engine E and the rear wheel WR which are configured to have four cycles of forced air-cooling single cylinder so as to exert the power for driving the rear wheel WR. The rear cushion unit 18 is formed between a continuously connecting portion of the inclined portion 15a and the horizontal portion 15b of the left seat frame 15 and the rear portion of the power unit P. Is provided.

  The engine body 19 of the engine E includes a crankcase 20 and a cylinder head 22 disposed in front of the crankcase 20. The continuously variable transmission M is accommodated in a transmission case 23 that extends to the rear, and the rear wheel WR is pivotally supported on the rear portion of the transmission case 23.

  In addition, a fan (not shown) that rotates in response to the operation of the engine E is accommodated in the transmission case 23, and in order to introduce cooling air into the transmission case 23 by the fan, One end of a bellows-like intake duct 24 is connected to the front, and the other end of the intake duct 24 is connected to the lower portion of the inclined portion 15a in the left seat frame 15. That is, air from the left seat frame 15 is introduced into the transmission case 23 as cooling air.

  Most of the engine body 19 is covered with a shroud 25, and a fan (not shown) for sucking cooling air into the shroud 25 from an inlet 26 opened in the right side wall of the shroud 25 is provided in the engine E. And is housed in the shroud 25.

  An intake device 28 is connected to an upper side surface of the cylinder head 22 in the engine body 19. The intake device 28 is disposed on the left side of the rear wheel WR, and the air cleaner 29 is connected to the air cleaner 29. A connecting tube 30 connected to the upstream end; a throttle body 31 connected to the downstream end of the connecting tube 30; and an intake pipe 32 connecting the throttle body 31 and the cylinder head 22; An injection valve 33 is attached.

  Further, an exhaust device 34 is connected to the lower side surface of the cylinder head 22. The exhaust device 34 includes an exhaust muffler 35 disposed on the right side of the rear wheel WR, the exhaust muffler 35 and the cylinder. And an exhaust pipe 36 connecting the heads 22.

  A first cross member 37 is provided between the middle portions of the inclined portions 15a of the two seat frames 15 constituting a part of the vehicle body frame F so as to straddle the front portion of the engine main body 19. A second cross member 38 is provided between the connecting portions of the inclined portions 15a... And the horizontal portions 15b.

  In FIG. 6, the vehicle body frame F is covered with a vehicle body cover 39 made of synthetic resin, and a tandem riding seat 40 is disposed on the rear portion of the vehicle body cover 39.

  The rear portion of the vehicle body frame F is disposed between a second cross member 38 provided between the two seat frames 15 and a connecting portion 16 that integrally connects the rear portions of the two seat frames 15. A fuel tank 42 disposed below the riding seat 40 is supported, and the fuel tank 42 is disposed above the power unit P.

  7 to 9 together, the fuel tank 42 is covered with a tank cover 44 from above, and the tank cover 44 is located forward of the fuel tank 42 and the two seat frames 15. A synthetic resin storage box 43 disposed between them is integrally connected to a rear upper edge of the storage box 43 and extends rearward from the storage box 43 so as to pass between the riding seat 40 and the fuel tank 42. . The storage box 43 is formed so as to open its upper end, and the upper end opening of the storage box 43 is closed at the front of the riding seat 40.

  Referring to FIG. 9, the fuel tank 42 is formed by joining a box-shaped upper tank half 45 opened downward and a box-shaped lower tank half 46 opened upward to each other. The upper tank half 45 and the lower tank half 46 are formed with a flange portion 42a projecting outward.

  A first stay 47 is fixed to the center portion of the second cross member 38 in the vehicle width direction so as to protrude upward, and the front portion of the flange portion 42a of the fuel tank 42 is fastened to and supported by the first stay 47. Is done. Further, second stays 48 projecting upward are fixed to the rear portions of the horizontal portions 15b of the both seat frames 15 ..., and the left and right rear portions of the flange portion 42a of the fuel tank 42 are second stays 48 ... Fastened to and supported by

  A third stay 49 protruding downward is fixed to the second cross member 38 at the portion where the first stay 47 is fixed, and the connecting portion 16 that integrally connects the rear portions of the two seat frames 15. A protruding fourth stay 50 is fixed, and a fender 51 disposed between the fuel tank 42 and the rear wheel WR so as to cover the rear wheel WR from above is provided below the third stay 49 and the fourth. Supported by the lower portion of the stay 50.

  Also, on the upper part of the fourth stay 50, there is a rear cover 52 that constitutes a part of the vehicle body cover 39 and is connected to the rear part of the tank cover 44, and a loading platform 53 that is arranged behind the riding seat 40. The bolts 55 are screwed together with the nuts 54 fixed to the upper portion of the fourth stay 50 and are supported.

  By the way, on both sides of the tank cover 44, there are integrally provided overhanging portions 44a that project outward from the riding seat 40, and both sides of the cargo bed 53 are smoothly connected to the overhanging portions 44a. Formed as follows. Thus, both the overhanging portions 44a... And both sides of the loading platform 53 function as grab rails that can be gripped by a passenger sitting at the rear of the riding seat 40.

  Referring also to FIG. 10, the rear portion of the tank cover 44 that covers the fuel tank 42 from above is a fifth stay that is formed in a substantially U shape that opens downward so as to straddle the rear portion of the fuel tank 42. Fastening plate portions 56a... Sandwiching the left and right rear portions of the flange portion 42a of the fuel tank 42 between the second stays 48... Provided. Thus, bolts 57 are inserted into the fastening plate portions 56a and the flange portions 42a, and these bolts 57 are screwed into weld nuts 58 fixed to the lower surface of the second stay 48. The fastening plate portions 56a at both left and right ends of the fifth stay 56 and the left and right rear portions of the flange portion 42a of the fuel tank 42 are fastened together with the second stay 48. Further, both sides of the rear portion of the tank cover 44 are fastened to the fifth stay 56 by bolts 59 and 59.

  Box receiving members 60, 60 are provided on both sides of the first cross member 37, and both front sides of the storage box 43 are connected to the box receiving members 60... Via elastic members (not shown). In this state, the two box receiving members 60 are fastened by bolts 61 and 61.

  By the way, the boarding seat 40 can rotate between a closed state in which the storage box 43 and the tank cover 44 are covered from above and an open state in which the storage box 43 and the tank cover 44 are opened. A seal member 62 (see FIG. 9) is pivotally supported on the upper front end of 43, and elastically contacts the upper end of the storage box 43 in the closed state on the lower surface of the riding seat 40. Installed.

  Further, an engaged member 63 is provided at a lower portion of the riding seat 40 at a position corresponding to the front portion of the tank cover 44, and a connecting portion of the storage box 43 and the tank cover 44 has a boarding position. A seat lock opening 64 is provided for allowing the engaged member 63 to enter with the use seat 40 closed.

  In addition, the seat lock stay 65 that contacts the front portion of the tank cover 44 at a position corresponding to the seat lock opening 64 from below is provided between the front portion of the flange portion 42 a of the fuel tank 42 and the first stay 47. The front portion of the flange portion 42a and the seat lock stay 65 are fastened to the first stay 47 by fastening together with a pair of bolts 66, 66. The front portion of the tank cover 44 is fastened to the seat lock stay 65 by bolts 67 and 67 disposed on the left and right sides of the seat lock opening 64.

  The seat lock stay 65 is provided with a seat lock mechanism (not shown). The seat lock mechanism is inserted into the seat lock opening 64 with the riding seat 40 closed. A locked state that engages with the engaging member 63 and holds the closed state of the riding seat 40, and an unlocked state that allows the engagement of the engaged member 63 to open the riding seat 40. And can be switched.

  A fuel filler 67 is provided on one side in the vehicle width direction on the upper surface of the rear portion of the fuel tank 42, in this embodiment on the left side in the vehicle width direction. The fuel supply port 67 is formed by a fuel supply cylinder 68 fixed to the upper tank half 45 of the fuel tank 42 so as to protrude upward from the upper surface of the fuel tank 42, and the fuel supply port 67 is a cap 69. It can be opened and closed. A tray 70 for receiving fuel spilled from the fuel filler 67 is disposed around the fuel filler 67, and the tray 70 is fixed to the fuel cylinder 68.

  An upper end portion of a pump module 72 for discharging the fuel in the fuel tank 42 is fastened by a plurality of bolts 73, 73. The fuel supply tube 74 connected to the pump module 72 extends from the pump module 72 to the front side above the fuel tank 42 on the right side in the vehicle width direction, and extends from the right side in the vehicle width direction to the left side along the second cross member 38. The fuel injection valve 33 has a portion and a portion extending toward the fuel injection valve 33 side along the inclined portion 15a of the left seat frame 15 from the second cross member 38 on the left side in the vehicle width direction. In order to support the oil supply tube 74, an oil supply tube support member 75 is attached to the second cross member 38, and the oil supply tube support members 76, 77 are attached to the inclined portion 15a of the left seat frame 15. A fuel supply tube support member 78 is attached to the upper surface of the shroud 25 in the vicinity of the fuel injection valve 33.

  The tank cover 44 is provided with an opening 79 that allows the fuel filler 67 provided on the upper surface of the fuel tank 42 to face upward, and the tray 70 closes the opening 79 so as to close the tank 79. It elastically contacts the lower surface of the cover 44.

  The tank cover 44 has a bulging portion 80 that dams up the fuel overflowing the outside of the opening 79 when refueling from above the refueling port 67. In particular, the rear portion 80a of the bulging portion 80 bulges upward and larger than the front portion, and the left and right side portions 80b and 80b bulge upward as they move from the front to the rear. It is formed to gradually increase the amount. Thus, on the rear portion 80a of the bulging portion 80, a pair of protrusions 40a provided in the lower rear portion of the riding seat 40 abut when the passenger sits on the riding seat 40. Thus, the rear portion 80a of the bulging portion 80 receives the load of the riding seat 40.

  By the way, the upper surface of the fuel tank 42 has a high portion 81 where the fuel filler 67 is provided and a low portion 82 lower than the high portion 81, and the pump module 72 is disposed in the low portion 82. In addition, the lower portion 82 is disposed to be deviated to the right in the vehicle width direction of the front portion of the upper surface of the fuel tank 42 and is formed so as to be inclined toward the crankcase 20 side of the engine body 19. Is done.

  The fuel gas evaporated in the fuel tank 42 is adsorbed by oil in the crankcase 20 which is fuel adsorbing means disposed below the upper surface of the fuel tank 42 so as to be adsorbed outside the fuel tank 42. The fuel gas generated in the fuel tank 42 is guided to the crankcase 20 through the charge pipe 84.

  The charge line 84 is connected to the tank side first line part 84a connected to the upper surface of the fuel tank 42, and the tank side first line part 84a, and from one side of the fuel tank 42 in the vehicle width direction. A tank-side second conduit portion 84b extending to the other side is provided at the end on the fuel tank 42 side, and the tank-side first conduit portion 84a extends from the connecting portion 85 to the upper surface of the fuel tank 42 in the vehicle width direction. Thus, it extends to one side of the fuel tank 42 and is connected to the tank-side second conduit portion 84b. Thus, in this embodiment, the connecting portion 85 to the upper surface of the fuel tank 42 is a fuel supply port 67 provided on the left side in the vehicle width direction of the upper surface of the fuel tank 42 in the high-order portion 81 on the upper surface of the fuel tank 42. The tank side first conduit portion 84a extends from the connecting portion 85 to the left side in the vehicle width direction, and is set to the tank side first side. A tank-side second conduit portion 84b connected to the one conduit portion 84a is piped so as to extend from the left side to the right side in the vehicle width direction.

  The tank-side first conduit portion 84a and the tank-side second conduit portion 84b are connected so as to surround the oil supply port 67 from the periphery, and the tank-side first and second conduit portions 84a, 84b. A part of is disposed so as to pass under the tray 70 which receives fuel spilled from the fuel filler 67. In addition, a portion of the tank side first and second pipe sections 84a and 84b that passes through the lower portion of the tray 70 is formed from a metal pipe 86 that is bent so as to surround a portion of the oil supply cylinder 68. For example, two places of the metal pipe 86 are held by pipe holding members 87 and 87. Further, attachment members 88 are welded to the upper portion 81 of the upper surface of the fuel tank 42 corresponding to the pipe holding members 87..., And the pipe holding members 87. And are installed with nuts 90. Thus, the fuel tank 42 is painted including the mounting members 88... And the metal pipe 86 is fastened to the painted fuel tank 42.

  The charge conduit 84 is connected to the tank-side second conduit portion 84b on the other side in the vehicle width direction (right side in this embodiment) and is disposed at the highest position of the charge conduit 84. A tank-side third conduit portion 84c having the highest position portion 91 at an intermediate position is provided, and the tank-side third conduit portion 84c is located on the upper surface of the fuel tank 42 above the low-order portion 82. It is piped to extend.

  A portion including at least the highest portion 91 in the tank-side third conduit portion 84 c includes an elastic tube 92, and the highest portion 91 of the elastic tube 92 is provided in the highest portion support portion 93 provided in the fuel tank 21. It is supported from below.

  Referring to FIG. 11, the highest support portion 93 includes a support plate 94 fixed to the upper surface of the fuel tank 42, and an upper open clamper 95 fixed to the support plate 94. The uppermost portion 91 of the elastic tube 92 is supported from below by a substantially U-shaped holding portion 95a formed in a part of the upper open clamper 95 and opened upward.

  The highest portion support portion 93 is disposed below the right side portion 80b of the bulging portion 80 provided in the tank cover 44, and a relatively large empty space is provided above the highest portion support portion 93. Will occur. Therefore, a rib 44b for preventing the elastic tube 91 from separating upward from the upper opening clamper 95 is provided integrally with the tank cover 44 so as to cross the inside of the right side portion 80b. The rib 44b is preferably disposed directly above the upper opening clamper 95. In this embodiment, the rib 44b is disposed directly above, but the elastic tube 91 is detached from the upper opening clamper 95 upward. As long as the position can prevent this, the elastic tube 91 may be slightly displaced from the upper open clamper 95 in the longitudinal direction.

  Moreover, as clearly shown in FIG. 10, the portion from the highest portion 91 to the connecting portion 85 to the fuel tank 42 in the charge pipe 84 is piped so as to be inclined downward toward the connecting portion 85 side. Yes.

  The fuel tank 42 includes a first check valve 96 that prevents the backflow of the fuel gas toward the fuel tank 42 downstream of the highest portion 91 in the third tank side pipe portion 84 c of the charge pipe 84. The first check valve 96 is disposed so as to be supported, and is disposed on the lower portion 82 of the upper surface of the fuel tank 42.

  By the way, a part of the third tank side pipe part 84c of the charge pipe 84 is connected to the first check valve 96 at the downstream end, and the elastic tube 92 disposed on the fuel tank 42 and the first tube 92c. And an elastic tube 97 disposed on the fuel tank 42 with an upstream end connected to the check valve 96, and the elastic tube 92 is located downstream of the portion held by the upper opening clamper 95. The upper open clamper 98 holds the upper end of the elastic tube 97 and the upper open clamper 99 holds it.

  Thus, the upper open clampers 98 and 99 are fixed in common to the support plate 100 fixed to the upper surface of the fuel tank 42, and the upper open clampers 95, 98 and 99 are provided on the upper surface of the fuel tank 42. The detachment of the elastic tubes 92 and 97 is prevented by a tank cover 44 that covers the fuel tank 42 from above.

  Incidentally, a branch portion 101 is provided in the third tank side conduit portion 84c of the charge conduit 84 on the fuel tank 42 side of the first check valve 96, and the fuel tank 42 is provided in the branch portion 101. An atmosphere introduction pipe 102 for introducing the atmosphere is connected to the inside, and a second check valve 103 for blocking the flow from the fuel tank 42 side is interposed in the atmosphere introduction pipe 102. Moreover, the second check valve 103 is disposed at a position higher than the highest portion 91 in the charge pipe 84 as clearly shown in FIG.

  The atmosphere introduction pipe line 102 is opened to the atmosphere below the second check valve 103, and in this embodiment, a pipe-like connecting part that connects the rear parts of the pair of left and right seat frames 15. The atmosphere introduction pipe line 102 is connected to the connecting portion 16 so that the atmosphere is opened in the atmosphere 16.

  In addition, a filter 104 is interposed in the atmosphere introduction conduit 102 on the atmosphere opening side, that is, on the connecting portion 16 side of the second check valve 103, and this filter 104 is connected to the atmosphere introduction conduit 102. Among these, it is interposed in the part which becomes a downward slope toward the said atmosphere open | release side, ie, the connection part 16 side.

  The air introduction pipe line 102 has one end connected to the branch part 101 and the other end connected to the second check valve 103 and one end connected to the third check valve 103. And an elastic tube 106 whose other end is connected to the filter 104 and an elastic tube 107 whose one end is connected to the filter 104 and whose other end is connected to the connecting portion 16 of the vehicle body frame F. The elastic tube 106 is disposed so as to be curved in an arc shape by connecting the second check valve 103 and the filter 104 disposed obliquely below and behind the second check valve 103. The elastic tube 107 and the elastic tube 107 are arranged so as to have a downward slope toward the connecting portion 16 side while connecting the filters 104 to each other.

  The other end portion of the elastic tube 105 and the one end portion of the elastic tube 106 are held by the upper opening clampers 108 and 109 at a position where the second check valve 103 is sandwiched between them. , 109 are fixed to a fifth stay 56 constituting a part of the vehicle body frame F, and the release of the elastic tubes 105, 106 from the upper opening clampers 108, 109 is a tank that covers the fuel tank 42 from above. It is blocked by the cover 44.

  The second check valve 104 is disposed below a rear portion 80a of the bulging portion 80 provided on the tank cover 44 that covers the fuel tank 42 from above so as to receive the load of the riding seat 40. .

  The charge pipe 84 is connected to the tank side third pipe section 84c on the other side in the vehicle width direction (right side in this embodiment) and along the second cross member 38 on one side in the vehicle width direction (this embodiment). A connecting conduit portion 84d extending to the left side in the form, and an engine-side first conduit that is connected to the connecting conduit portion 84d and extends above and below the engine body 19 so as to extend vertically on one side in the vehicle width direction. An engine-side second pipe portion 84f that extends from the one side in the vehicle width direction to the other side and extends above the engine body 19 on the one side in the vehicle width direction to the lower end of the engine-side first pipe portion 84e. And an engine-side third conduit portion 84g connected to the engine body 19 connected to the engine-side second conduit portion 84f on the other side in the vehicle width direction.

  In this embodiment, the connecting conduit portion 84d is connected to the tank side third conduit portion 84c on the right side in the vehicle width direction and extends to the left side in the vehicle width direction along the second cross member 38. The upper end of the first pipe portion 84e is connected to the left side in the vehicle width direction and extends to the right side in the vehicle width direction along the second cross member 38. The tank side third, second and first pipe portions 84c, 84b, 84a are connected to each other. To be connected to the fuel tank 42. The engine-side first conduit portion 84e extends vertically on the left side in the vehicle width direction, and the engine-side second conduit portion 84f extends above the engine body 19 so as to extend from the left side in the vehicle width direction to the right side. The side third conduit portion 84g is connected to the crankcase 20 of the engine body 19 on the right side in the vehicle width direction.

  The vehicle body frame F is provided with a frame-side support portion 110 that supports an intermediate portion of the engine-side first pipe portion 84e, and an upper side surface of the shroud 25 in the engine E is provided with the engine-side second pipe passage. An engine-side support portion 111 that supports an intermediate portion of the portion 84f is provided, and the engine-side support portion 111 is attached to the upper side surface of the shroud 25 by tightening together with the oil supply tube support member 77 by a bolt 112. .

  Moreover, the engine-side support 111 is disposed on one side in the vehicle width direction (left side in this embodiment) from the intake device 28 in plan view, and the frame-side support 110 is more than the engine-side support 111. It is disposed obliquely upward on the rear side and is provided on the inclined portion 15a of the seat frame 15 on one side in the vehicle width direction (left side in this embodiment) of the two seat frames 15.

  Moreover, at least the portion between the engine side support portion 111 and the frame side support portion 110 of the charge conduit 84 is made of an elastic tube 97, and in this embodiment, a part of the tank side third conduit portion 84c. And an elastic tube 97 having one end connected to the first check valve 96, so that the whole of the connecting pipe part 84d, the whole of the engine side first pipe part 84e, and the engine side second pipe part 84f. And a part of the engine-side third pipe portion 84g.

  Further, as shown in FIG. 1, the engine-side second conduit portion 84 f is piped so as to pass below the connecting tube 30 and the throttle body 31 in the intake device 28.

  In FIG. 12, the engine-side third conduit portion 84g is provided on the right side of the crankcase 20 so as to supply oil into the crankcase 20 of the engine body 19, extends obliquely upward, and has an upper end 115 as a cap. Is connected to the crankcase 20 so as to be adjacent to the oil supply pipe 116 closed in the vehicle width direction, and a part of the elastic tube 97 and an upper end portion of the elastic tube 97 are connected to the crankcase 20. The other end of the tubular body 117 is opened below the oil level L of the oil in the crankcase 20 into the crankcase 20. . As a result, the fuel gas evaporated in the fuel tank 42 and guided by the charge pipe 84 is adsorbed by the oil in the crankcase 20.

  Next, the operation of this embodiment will be described. A charge line 84 for guiding the fuel gas evaporated in the fuel tank 42 to the crankcase 20 side as the fuel adsorbing means is connected to the upper surface of the fuel tank 42. One conduit portion 84a and the tank-side first conduit portion 84a are connected and extend from one side of the fuel tank 42 in the vehicle width direction (left side in this embodiment) to the other side (right side in this embodiment). Since the tank side second conduit portion 84b is provided at the end on the fuel tank 42 side, and the tank side first and second conduit portions 84a and 84b are fixed to the upper surface of the fuel tank 42, the tank side first tube Even if the road portion 84a is connected to the fuel tank 42 at any position in the vehicle width direction, the amount of fuel flowing out from the fuel tank 42 to the crankcase 20 side via the charge line 84 when the motorcycle falls over is reduced. Can win, and since at least a part of the charge pipe passage 84 can be pre-attached to the fuel tank 42, it is possible to contribute to improvement of the assembling property.

  Also, the tank-side first conduit portion 84a extends from the connecting portion 85 to the upper surface of the fuel tank 42 to one side of the fuel tank 42 (left side in this embodiment) in the vehicle width direction. Since it is connected to 84b, it is possible to effectively suppress the outflow of fuel when the vehicle falls over.

  A fuel supply port 67 is provided on one side of the upper surface of the fuel tank 42 in the vehicle width direction (left side in this embodiment), and the tank side first connected to the upper surface of the fuel tank 42 at a position offset from the fuel supply port 67. Since the pipe line portion 84a and the tank side second pipe line portion 84b are continuously provided so as to surround the fuel filler port 67 from the periphery, the tank side first and second tanks are made using the dead space around the fuel filler port 67. A part of the pipe parts 84a and 84b can be piped with a large curvature, and the arrangement of the tank side first and second pipe parts 84a and 84b can be facilitated.

  A tray 70 for receiving fuel spilled from the fuel supply port 67 is disposed around the fuel supply port 67, and a part of the tank side first and second pipe sections 84 a and 84 b are below the tray 70. Therefore, even if part of the tank side first and second pipe sections 84a and 84b are piped so as to surround the oil filler port 67, the area of the tray 70 can be increased. .

  By the way, the charge pipe 84 is connected to the tank side second pipe portion 84b on the other side in the vehicle width direction (right side in this embodiment) and is arranged at the highest position of the charge pipe 84. It has the tank side 3rd pipe part 84c which has the positioning part 91 in an intermediate position, and it can suppress the outflow of the fuel at the time of a fall more effectively.

  Moreover, at least a portion including the highest portion 91 of the tank side third conduit portion 84c is formed of an elastic tube 92, and the highest portion 91 of the elastic tube 92 is a highest portion support portion 93 provided in the fuel tank 42. Since it is supported from below, the height of the highest part 91 is determined by the height of the highest part support part 93, and the degree of freedom in design can be increased. Further, since the portion from the highest portion 91 to the connection portion 85 to the fuel tank 42 in the charge pipe 84 is piped downwardly toward the connection portion 85 side, the fuel tank 42 is connected to the fuel tank 42 from the highest portion 91. It is easy to return the fuel accumulated in the charge pipe 84 to the fuel tank 42 side.

  Further, the downstream end of the charge pipe 84 is connected to the crankcase 20 so as to be open to the oil in the crankcase 20, and the fuel tank is located downstream of the highest portion 91 in the charge pipe 84. Since the first check valve 96 for preventing the backflow of the fuel gas to the 42 side is interposed, the first check valve 96 effectively prevents the oil in the crankcase 20 from flowing to the fuel tank 42 side. In addition, since the first check valve 96 is supported by the fuel tank 42, the assembling property is improved.

  Further, the upper surface of the fuel tank 42 has a high level portion 81 provided with a fuel filler 67 and a low level portion 82 lower than the high level portion 81, and the first check valve 96 is disposed on the low level portion 82. It can be avoided that the arrangement position of the first check valve 96 becomes high. Moreover, since the lower portion 82 is inclined so as to be lowered toward the crankcase 20, the flow of the fuel gas passing through the first check valve 96 can be smoothed.

  In addition, an air introduction conduit 102 for introducing the atmosphere into the fuel tank 42 is connected to a branching portion 101 provided in the third tank side conduit portion 84c of the charge conduit 84 on the fuel tank 42 side of the first check valve 96. Since the second check valve 103 for preventing the flow from the fuel tank 42 side is provided in the atmosphere introduction pipe line 102, the atmosphere is introduced into the fuel tank 42 when the pressure in the fuel tank 42 becomes negative. Thus, the inside of the fuel tank 42 can be adjusted to the atmospheric pressure, and the second check valve 103 can prevent the fuel gas from being discharged to the outside through the atmosphere introduction pipe 102.

  In addition, portions of the elastic tubes 92 and 97 constituting at least a part of the charge pipe 84 that are disposed on the fuel tank 42 are held by upper release clampers 95, 98, and 99 provided on the upper surface of the fuel tank 42, In addition, since the fuel tank 42 is covered from above with the tank cover 44 that prevents the elastic tubes 92 and 97 from being released from the open clampers 95, 98, and 99, a part of the charge pipe 84 is covered with a simple structure. It can be supported on the top and the assembling property is improved.

  Further, the outer surface of the fuel tank 42 is painted, and the metal pipe 86 constituting a part of the charge conduit 84 is fastened to the fuel tank 42, whereby the metal pipe 86 is fixed to the fuel tank 42 by welding. Compared with what to do, it is not necessary to mask the metal pipe 86, and the coating cost can be reduced.

  The second check valve 103 is disposed at a position higher than the highest portion 91 provided in the third tank side pipe portion 84c of the charge pipe 84, and fuel to the second check valve 103 side. Inflow of fuel can be suppressed, fuel can be prevented from adhering to the second check valve 103, and the durability of the second check valve 103 can be enhanced.

  Further, since the branch portion 101 is provided in the third conduit portion 84c on the fuel tank 42 side with respect to the highest portion 91, the connection portion to the charge conduit 84, that is, the second reverse portion from the branch portion 101 when the motorcycle falls. Even if the fuel flowing out from the fuel tank 42 enters the atmosphere introduction pipe 102 up to the stop valve 103, the fuel in the atmosphere introduction pipe 102 flows into the charge pipe 84 when the motorcycle is raised after the fall. It will return to the upstream side from the highest part 91, and it can prevent that a fuel flows into the engine main body 19 side.

  Further, since the air introduction pipe line 102 is opened to the atmosphere below the second check valve 103, even if water enters the atmosphere introduction pipe line 102 from the open end of the atmosphere, It is possible to make it difficult to reach the check valve 103, and the filter 104 is interposed in the atmosphere introduction pipe 102 on the atmosphere opening side with respect to the second check valve 103. It becomes difficult to adhere. In addition, since the filter 104 is interposed in the portion of the atmosphere introduction pipe 102 that is inclined downward toward the atmosphere opening side, water is allowed to escape from the filter 104 to the atmosphere opening end side even if the filter 104 gets wet with water. be able to.

  Further, the tank cover 44 provided with an opening 79 that covers the fuel tank 42 from above and has a fuel supply port 67 provided on the upper surface of the fuel tank 42 facing upward receives the load of the riding seat 40 and the fuel supply port 67. A bulging portion 80 is provided so as to bulge the fuel overflowing the outside of the opening 79 when refueling from above, and a second check valve 104 is disposed below the bulging portion 80. Therefore, the second check valve 103 can be arranged at a high position so that the infiltrated water can hardly be reached by the second check valve 103.

  The charge pipe 84 extends vertically on one side in the vehicle width direction of the engine main body 19 (left side in this embodiment), and is disposed above the engine main body 19. And the engine side that extends from the vehicle width direction one side to the other side (in this embodiment, the right side) on the one side in the vehicle width direction and is connected to the lower end of the engine side first conduit portion 84e. Since the second pipe section 84f and the engine side third pipe section 84g connected to the engine body 19 on the other side in the vehicle width direction and connected to the engine main body 19 are provided, the motorcycle falls over. Occasionally, the oil in the engine body 19 can be prevented from flowing into the charge line 84.

  In addition, a frame side support portion 110 that supports the engine side first conduit portion 84e is provided on the vehicle body frame F, and an engine side support portion 111 that supports the engine side second conduit portion 84f is provided on the shroud 25 of the engine E. In addition, since at least the engine side support 111 and the frame side support 110 in the charge line 84 are formed of the elastic tube 97, the charge line 84 can follow the swing of the engine E.

  Further, since the engine-side second conduit portion 84f is disposed so as to pass under the intake device 28 extending rearward from the upper side surface of the cylinder head 22 in the engine body 19, a dead space below the intake device 28 is provided. A part of the charge pipeline 84 can be arranged using

  In addition, since the engine side support portion 111 is provided in the engine E on the one side in the vehicle width direction from the intake device 28 in a plan view, a portion of the charge pipe 84 that passes below the intake device, that is, the second engine side pipe. The road portion 84f can be fixed so as not to swing with respect to the engine main body 19, and the intake device 28 can be disposed close to the engine main body 19 while avoiding contact with the charge pipe line 84. This can contribute to the compactness of E.

  The vehicle body frame F includes a pair of left and right seat frames 15 each having an inclined portion 15a extending rearward, and the power unit P is swingably supported by the vehicle body frame F below the seat frames 15. The frame-side support portion 110 is disposed obliquely above and rearward of the engine-side support portion 111, and the inclined portion of the seat frame 15 on one side in the vehicle width direction (the left side in this embodiment) of the two seat frames 15. Since it is provided in 15a, the engine side support part 111 and the frame side support part 110 are spaced apart in the front-rear direction, and the amount of bending of the elastic tube 97 accompanying the swinging of the power unit P can be reduced.

  Further, a second cross member 38 is provided between the pair of seat frames 15 behind the frame side support 110, and a fuel tank 42 disposed behind the second cross member 38 is disposed between the seat frames 15. The charge line 84 is connected to the upper end of the engine side first line part 84e on one side in the vehicle width direction and extends to the other side in the vehicle width direction along the second cross member 38 to the fuel tank 42. Since the connecting conduit portion 84d is connected, the oil outflow from the engine body 19 side into the charge conduit 84 can be more effectively suppressed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, the invention described in claims 1 to 7 can be applied to a motorcycle in which a canister as a fuel adsorbing means is disposed below the upper surface of the fuel tank 42.

20 ... Crankcase 42 as fuel adsorbing means ... Fuel tank 44 ... Tank cover 67 ... Fuel supply port 70 ... Tray 81 ... Higher part 82 ... Lower part 84 ... Charge pipe 84a ... tank side first pipe part 84b ... tank side second pipe part 84c ... tank side third pipe part 85 ... connection part 86 ... metal pipe 91 ... highest part 92,97 ... elastic tube 93 ... highest part support part 95,98,99 ... upper open clamper 96 ... first check valve 101 ... branch part 102 ..Air introduction pipe 103 ... second check valve 104 ... filter E ... engine WR ... rear wheel

Claims (13)

  An engine (E) that exerts power for driving the rear wheels (WR), a fuel tank (42) that stores fuel supplied to the engine (E), and a fuel gas evaporated in the fuel tank (42) Is adsorbed outside the fuel tank (42) so as to be disposed below the upper surface of the fuel tank (42), and the fuel adsorbing means (42) from the fuel tank (42). 20) A motorcycle including a charge pipe (84) for introducing fuel gas to the tank, the tank-side first pipe section (84a) connected to the upper surface of the fuel tank (42). ) And a tank-side second conduit portion (84b) that extends from one side of the fuel tank (42) to the other side in the vehicle width direction and that extends to the tank-side first conduit portion (84a). (42) at the end of the side, The first and second pipe portions tank side (84a, 84b) evaporative fuel processing system in the motorcycle, characterized in that is fixed to the upper surface of the fuel tank (42).   A tank-side first conduit portion (84a) extends from the connecting portion (85) to the upper surface of the fuel tank (42) to one side of the fuel tank (42) in the vehicle width direction and extends to the tank-side second conduit. The evaporative fuel processing device for a motorcycle according to claim 1, wherein the evaporative fuel processing device is connected to the portion (84 b).   A fuel supply port (67) is provided on one side in the vehicle width direction on the upper surface of the fuel tank (42), and is connected to the upper surface of the fuel tank (42) at a position offset from the fuel supply port (67). The evaporation in the motorcycle according to claim 2, wherein the pipe part (84a) and the tank side second pipe part (84b) are connected so as to surround the fuel filler port (67) from the periphery. Fuel processor.   A tray (70) for receiving fuel spilled from the fuel filler port (67) is disposed around the fuel filler port (67), and part of the tank side first and second pipe sections (84a, 84b) The evaporative fuel processing device for a motorcycle according to claim 3, wherein the evaporative fuel processing device is disposed so as to pass under the tray (70).   The charge pipe (84) is connected to the tank-side second pipe section (84b) on the other side in the vehicle width direction, and is arranged at the highest position of the charge pipe (84). The evaporative fuel processing device for a motorcycle according to any one of claims 1 to 4, further comprising a tank-side third pipe section (84c) having a section (91) at an intermediate position.   A portion including at least the highest position portion (91) in the tank side third conduit portion (84c) is formed of an elastic tube (92), and the highest portion (91) of the elastic tube (92) is the fuel tank. The evaporative fuel processing device for a motorcycle according to claim 5, wherein the evaporative fuel processing device is supported from below by a highest part support portion (93) provided in (42).   The charge pipe (84) is piped from the highest part (91) to the connection part (85) to the fuel tank (42) so as to have a downward slope toward the connection part (85). The evaporative fuel processing apparatus in a motorcycle according to claim 5 or 6, characterized in that   The fuel adsorbing means is a crankcase (20) that stores oil adsorbing the fuel gas and constitutes a part of the engine (E), and a downstream end of the charge pipe (84) is in the oil Connected to the crankcase (20) so as to open to the fuel tank (42) downstream of the highest portion (91) of the charge pipe (84). Evaporative fuel processing in a motorcycle according to any one of claims 5 to 7, wherein a first check valve (96) for blocking is interposed so as to be supported by the fuel tank (42). apparatus.   The upper surface of the fuel tank (42) has a high level part (81) in which the fuel filler port (67) is provided, and a low level part (82) lower than the high level part (81), and a first check valve ( 96. The evaporative fuel processing device for a motorcycle according to claim 8, wherein 96) is disposed on the lower portion (82).   The evaporated fuel processing device for a motorcycle according to claim 9, wherein the lower portion (82) is formed so as to be inclined toward the crankcase (20).   An air introduction line (leading the atmosphere into the fuel tank (42) to a branch part (101) provided in the charge line (84) on the fuel tank (42) side of the first check valve (96). 102) is connected, and a second check valve (103) for preventing flow from the fuel tank (42) side is interposed in the air introduction pipe (102). The evaporative fuel processing apparatus in the motorcycle in any one of Claims.   Of the elastic tubes (92, 97) constituting at least a part of the charge pipe (84), a portion disposed on the fuel tank (42) is provided on the upper surface of the fuel tank (42). The fuel tank (42) is held by the clamper (95, 98, 99) and the tank cover (44) prevents the elastic tube (92, 97) from being released from the open clamper (95, 98, 99). The evaporative fuel processing apparatus in a motorcycle according to any one of claims 1 to 11, wherein the fuel is covered from above.   The outer surface of the fuel tank (42) is coated, and a metal pipe (86) constituting a part of the charge pipe (84) is fastened to the fuel tank (42). The evaporative fuel processing apparatus in the motorcycle in any one of 1-12.

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